The Ring Jr Flash basically is a Jr Ring with a built up fuselage. The wing is the same, and the stab/el either is the same or close. The rudder is more of the P-51 or early Jet style.
By the way, someone could make a Super Jr Ringmaster by bashing this kit just a little. You would remove the bubble canopy, an substitute a turtle deck, a la the standard Super Ring. Also, change the rudder to the traditional Ringmaster style.
Currell